Phoenix Audio Octopus - Manual (Page 10)

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In addition the interface includes a double-switch with four
positions that is used to set up output level for different
telephone systems.
The user initiates the call through the telephone and then
switches to the Octopus by pushing the Headset button on
the telephone (just like using headset with the telephone).
The factory setting for the telephone switches delivers the
lowest level output (see gain diagram below). We
recommend that when tuning the unit you should start with
this lowest level and increase the gain until the other side
complains that the signal is distorted. Note that these
switches affect the output (signal that goes to the other side
and not the signal coming in).
Note: the Octopus can communicate in parallel with the VC,
IP link (USB), and either a PSTN or DTI the telephone
interface (only one telephone interface can be integrated into
the Octopus). Two of these three links can communicate
with each other (through the Octopus). The user can select
which two and set their volume levels separately. More
details in the following chapters.